Blackout flash hider



FIG. 1 is a side elevational view of a blackout flash hider showing my new design;

FIG. 2 is another side elevational view shown in a rotated position thereof;

FIG. 3 is a front view thereof; and,

FIG. 4 is a rear view thereof.

The broken lines in the Figures are for illustrative purposed only and form no part of the claimed design. 

The ornamental design for a blackout flash hider, as shown and described. 